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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ishitani, M. Zhu, J. K. Liu, J. Kim, C. S. Halfter, U. |
| Description | Author Affiliation: Liu J ( Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA.); |
| Abstract | In Arabidopsis thaliana, the Salt Overly Sensitive 2 (SOS2) gene is required for intracellular Na(+) and K(+) homeostasis. Mutations in SOS2 cause Na(+) and K(+) imbalance and render plants more sensitive toward growth inhibition by high Na(+) and low K(+) environments. We isolated the SOS2 gene through positional cloning. SOS2 is predicted to encode a serine/threonine type protein kinase with an N-terminal catalytic domain similar to that of the yeast SNF1 kinase. Sequence analyses of sos2 mutant alleles reveal that both the N-terminal catalytic domain and the C-terminal regulatory domain of SOS2 are functionally essential. The steady-state level of SOS2 transcript is up-regulated by salt stress in the root. Autophosphorylation assays show that SOS2 is an active protein kinase. In the recessive sos2-5 allele, a conserved glycine residue in the kinase catalytic domain is changed to glutamate. This mutation abolishes SOS2 autophosphorylation, indicating that SOS2 protein kinase activity is required for salt tolerance. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 7 |
| Volume Number | 97 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2000-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Adaptation, Physiological Genetics Arabidopsis Protein-Serine-Threonine Kinases Amino Acid Sequence Enzymology Physiology Arabidopsis Proteins Cloning, Molecular DNA, Plant Molecular Sequence Data Osmolar Concentration Plant Roots Sequence Homology, Amino Acid Up-Regulation Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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